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Asset Retirement Obligations (Details)
$ in Thousands
9 Months Ended
Sep. 30, 2019
USD ($)
Asset Retirement Obligation, Roll Forward Analysis [Roll Forward]  
Asset retirement obligations as of January 1, 2019 $ 13,895
Liabilities acquired 101
Liabilities incurred 1,075
Liabilities divested and settled (1,112)
Accretion expense 670
Asset retirement obligations as of September 30, 2019 $ 14,629